You can actually have any number of testing frameworks in use at the same time. For example, you can use cucumber, rspec, test-unit and mini-test and they will all function without stepping on each other's feet. To use rspec in rails simply add the following to your Gemfile:
group :development, :test do
gem 'rspec-rails'
end
Then update or install your bundle and run the following command to setup rspec:
rails generate rspec:install
You can find more information here.
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